The web community is diving into responsive web design with reckless abandon. And though our intentions are good, our users may be suffering from our lack foresight. The sites we're building may look great on a smart-phone, but the megabytes of data we require them to download is resulting in less than stellar experiences. As developers, we need to take it upon ourselves to provide our users with a performant experience while at the same time providing access to all of the content and information they would expect while on a larger-screen device. This session will discuss the wide variety of issues a developer should consider while building a responsive site, including lessons learned while building the latest Notre Dame (nd.edu) homepage.